A magnitude-5.3 earthquake and another of magnitude-5.8 struck Fukushima and Ibaraki prefectures early Thursday, the Meteorological Agency said. No tsunami warning was issued.
The earthquakes occurred at 12:44 a.m. and 2:53 a.m., originating at depths of about 60 km and 30 km off the coast of Fukushima, respectively. They measured up to 4 on the Japanese seismic scale to 7 in southern Fukushima and northern Ibaraki.
After the quakes, no abnormalities were detected at the crippled Fukushima No. 1 nuclear plant and the nearby idled Fukushima No. 2 plant, according to Tokyo Electric Power Company Holdings Inc.
Fukushima was hit hard by the March 11, 2011, earthquake-tsunami and nuclear crisis.